Trouble with Text Disappearing while Rotoscoping

I am working with Adobe After Effects CS6 and I am using the Roto Brush to do a simple mask out of a person walking behind a text.

It's about a 10 second clip but after about 4-5 seconds in of rotoscoping the text just disappears? Any ideas of what is causing this? The text layer is still there, and the text will show back up after the video footage but for some reason the text just disappears in the middle of the clip.

Have you taken a look at the rotoscoped layer to ensure that it has properly painted your foreground on every frame. I find with the rotobrush there are times when it be fine one frame, but the next frame it well select your entire plate and basically forces you to repaint over your foreground.

My suggestion would be to ram preview the layer with the rotobrush and see if it properly rotoscoped through the entire sequence.